| Tag | Value |
|---|---|
| file | Descriptive-statistics_uva-variance-515-en_uva-variance-515-en |
| name | uva-variance-515-en |
| section | Descriptive statistics/Summary Statistics/Measures of Spread/Variance |
| type | schoice |
| solution | TRUE, FALSE, FALSE, FALSE |
| Type | Conceptual |
| Language | English |
| Level | Statistical Literacy |
| IRT-Difficulty | 4.42 |
| p-value | 0.0284 |
Given two independent stochastic variables x (with mean 3 and variance 5) and y (with mean 6 and variance 4). z = x - y. Mean and variance of z are then respectively